Answers for "how to call a comparator in collections.sort"

collections.sort custom comparator

ArrayList<Employee> employees = getUnsortedEmployeeList();
             
Comparator<Employee> compareById = (Employee o1, Employee o2) -> o1.getId().compareTo( o2.getId() );
 
Collections.sort(employees, compareById);
 
Collections.sort(employees, compareById.reversed());

sorting collections with comparator java

Collections.sort(marvel, new Comparator<String>() {
            @Override
            public int compare(String hero1, String hero2) {
                return hero1.compareTo(hero2);
            }
        });

collections.sort custom comparator

ArrayList<Employee> employees = getUnsortedEmployeeList();
             
Comparator<Employee> compareById = (Employee o1, Employee o2) -> o1.getId().compareTo( o2.getId() );
 
Collections.sort(employees, compareById);
 
Collections.sort(employees, compareById.reversed());

sorting collections with comparator java

Collections.sort(marvel, new Comparator<String>() {
            @Override
            public int compare(String hero1, String hero2) {
                return hero1.compareTo(hero2);
            }
        });